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)(17,18,24,29,23,28,21,27)(19,26,30,22,20,25,31,32)(2,5)(3,7)(9,11,13,12)(10,14,15,16)(17,19,23,20)(18,25,28,26)(21,31,24,30)(22,29,32,27)(9,12,13,11)(10,14,15,16)(17,20,23,19)(18,26,28,25)(21,30,24,31)(22,27,32,29)(1,3,4,7)(2,6,5,8)(17,21,23,24)(18,27,28,29)(19,30,20,31)(22,25,32,26)(2,5)(6,8)(17,22,24,25,23,32,21,26)(18,20,29,31,28,19,27,30)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.