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