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