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