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