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