how to get this data shown as GRAPH.
What kind of data and how many values do you want to display on the graph?
I think the Google Charts is a good and easy tool to display data on a chart.
If you have a lot of values (20 or more) I suggest that you send the data over a ethernet shield to a web database (i.e. MySQL). With an additional webscript you can read the data from the database an display it on a website on a internet site or in your intranet.