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