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