Yes the diagram does show colors and the colors may or may not match, as you said. There is one other thing the diagram shows:>>>> Where each wire goes.

On the diagram, (Old Car Manual Project) the rear end of switch is where the AMM wire is. Opposite end is the knob end. Wires are labeled as to function and colors are given.
If you need further help, just post again.
It is also possible your switch is not original. Could be the same as original or slightly different. If it does not match the diagram, post pics of your switch.
There are errors on some internet pics of how to wire. I.E. Devestechnet.com pic is wrong.