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