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