If the motor is truly 5HP then it will already be 240V, but I'm not sure when compressor makers started inflating the numbers. The contactor device is the pressure switch which cycles the motor on when the pressure drops and off when it reaches a preset limit.
I have an air compressor looks to be dated 1963 , built by wayne pump co. and has a single phase 5HP. GE triclad capacitor motor model number
So I will take that as a no to a diagram.?
Why don't you learn to use google?
A quick search on 'air compressor starter wiring diagram' would give you this.....
Regards Lee in Toronto
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