I found this schematic but I don't know how to translate it to Liberator scheme.
It's going to be 1 humbucker, 1 volume (Liberator pot) and 3-way toggle (series-split-parallel).
I did a quick search but no result. I need help here.
Employing the Liberator just means that you screw the pickup conductors into their respective terminals and fly colour coded cables from the Liberator PCB to the mode switch.
Since the green and bare conductors will be grounded on the Liberator PCB, there should be no need to connect them to the mode switch. (The switch itself still requires a ground connection in order for the parallel and single modes to work.)