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