One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10)(11,14)(12,16)(13,15)(17,18,24,26,23,28,21,31)(19,29,27,32,30,22,20,25)(1,3,4,7)(2,5,6,8)(9,11,14,10)(12,16,13,15)(17,19)(18,22)(20,21)(23,30)(24,27)(25,26)(28,29)(31,32)(2,6)(5,8)(9,12,14,13)(10,15,11,16)(17,20,23,27)(18,25,28,32)(19,21,30,24)(22,26,29,31)(9,12,14,13)(10,16,11,15)(17,21,23,24)(18,26,28,31)(19,27,30,20)(22,32,29,25)(9,13,14,12)(10,16,11,15)(17,22,21,32,23,29,24,25)(18,27,31,19,28,20,26,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.