Creating a Graph in Processing using Digital input from Arduino+Accelerometer

I am extremely new to Processing. I have connected my dual axis accelerometer to my arduino and the information displays in my serial monitor. I uploaded StandardFirmata to my arduino and I ran arduino_input (from processing examples). I can see the information is being processed by the two squares in processing lighting up.
The question I have now (because I am so terrible at programming) is, what code do I need to visualize the digital input into a graph?

Processing

/*
arduino_input

Demonstrates the reading of digital and analog pins of an Arduino board
running the StandardFirmata firmware.

To use:
* Using the Arduino software, upload the StandardFirmata example (located
  in Examples > Firmata > StandardFirmata) to your Arduino board.
* Run this sketch and look at the list of serial ports printed in the
  message area below. Note the index of the port corresponding to your
  Arduino board (the numbering starts at 0).  (Unless your Arduino board
  happens to be at index 0 in the list, the sketch probably won't work.
  Stop it and proceed with the instructions.)
* Modify the "arduino = new Arduino(...)" line below, changing the number
  in Arduino.list()[0] to the number corresponding to the serial port of
  your Arduino board.  Alternatively, you can replace Arduino.list()[0]
  with the name of the serial port, in double quotes, e.g. "COM5" on Windows
  or "/dev/tty.usbmodem621" on Mac.
* Run this sketch. The squares show the values of the digital inputs (HIGH
  pins are filled, LOW pins are not). The circles show the values of the
  analog inputs (the bigger the circle, the higher the reading on the
  corresponding analog input pin). The pins are laid out as if the Arduino
  were held with the logo upright (i.e. pin 13 is at the upper left). Note
  that the readings from unconnected pins will fluctuate randomly. 
  
For more information, see: http://playground.arduino.cc/Interfacing/Processing
*/

import processing.serial.*;

import cc.arduino.*;

Arduino arduino;

color off = color(4, 79, 111);
color on = color(84, 145, 158);

void setup() {
  size(470, 280);

  // Prints out the available serial ports.
  println(Arduino.list());
  
  // Modify this line, by changing the "0" to the index of the serial
  // port corresponding to your Arduino board (as it appears in the list
  // printed by the line above).
  arduino = new Arduino(this, Arduino.list()[0], 57600);
  
  // Alternatively, use the name of the serial port corresponding to your
  // Arduino (in double-quotes), as in the following line.
  //arduino = new Arduino(this, "/dev/tty.usbmodem621", 57600);
  
  // Set the Arduino digital pins as inputs.
  for (int i = 0; i <= 13; i++)
    arduino.pinMode(i, Arduino.INPUT);
}

void draw() {
  background(off);
  stroke(on);
  
  // Draw a filled box for each digital pin that's HIGH (5 volts).
  for (int i = 0; i <= 13; i++) {
    if (arduino.digitalRead(i) == Arduino.HIGH)
      fill(on);
    else
      fill(off);
      
    rect(420 - i * 30, 30, 20, 20);
  }

  // Draw a circle whose size corresponds to the value of an analog input.
  noFill();
  for (int i = 0; i <= 5; i++) {
    ellipse(280 + i * 30, 240, arduino.analogRead(i) / 16, arduino.analogRead(i) / 16);
  }
}

I am extremely new to Processing.

So new you didn't recognize that Processing != Arduino? Boy, that is new.

I uploaded StandardFirmata to my arduino

Which turned it into an idiot.

what code do I need to visualize the digital input into a graph?

That's a Processing question, NOT an Arduino question.