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