Don't understand what you need the diagram for,add-on lights or bike original wiring.If it's for the bike you can look in your service manual.
Not all companies that make add-on lights for our bikes use wiring that is color coded to the bike wiring and if someone besides you wired the lights or a previous owner,there's no telling what the lights were wired into without tracing each wire back to it's connection point.
If your reason is a problem with the lights,a multi-tester could help you to keep all positive 12 volt wiring together and all negative grounds no matter what their color is.