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