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