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