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