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