I'd connect all servos to one power supply, and all controllers to another one, so that the controller voltage is not disturbed by servo movements. The Gnd line is common to all parts, as you already know.
When you want to use a DC power supply, spend two regulators to provide the separate controller and servo supply voltages.
Of course the DC power supply must be capable of driving all servos (plus controllers) at the same time. When you need more power for the servos, e.g. more than 1A from a LM7805, you can split the servo power line into more lines, each with its own regulator.
BTW a circuit diagram is more useful than a wiring diagram, to readers of your posting. Have a look at the output options of your software (Fritzing?).