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