Its a bit trial and error really but i'd start with something like 32/33 psi in the front and 30 in the rear ;-)
Its a good idea to check the pressures as soon as you come off the track, if its a dry day you might find with the heat in the tyres the pressures have risen by 5/6psi or more (unless they're inflated with nitrogen) Then its upto you, if you want the tyres to last longer you could leave them at a slightly higher pressure but if you dont care about how long they last and want grip you could always drop the pressure a bit ;-)