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