One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,16)(13,15)(17,18,23,27)(19,29,30,24)(20,22,26,32)(21,28,31,25)(9,11,14,10)(12,16,13,15)(17,19,23,30)(18,24,27,29)(20,21,26,31)(22,25,32,28)(2,5)(6,8)(9,12,14,13)(10,15,11,16)(17,20,21,30,23,26,31,19)(18,22,28,24,27,32,25,29)(1,3,4,7)(2,6,5,8)(9,12,14,13)(10,15,11,16)(17,21,23,31)(18,25,27,28)(19,26,30,20)(22,24,32,29)(9,13,14,12)(10,15,11,16)(17,22,31,29,23,32,21,24)(18,26,25,30,27,20,28,19)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.