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)(12,14)(13,16)(19,20)(21,23)(26,28)(27,32) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,11)(10,12)(13,14)(15,16)(17,18,22,24)(19,23,20,21)(25,26,29,28)(27,31,32,30)(9,12)(10,14)(11,16)(13,15)(17,19,22,20)(18,23,24,21)(25,27)(26,30)(28,31)(29,32)(1,4,5,2)(3,7,8,6)(9,12)(10,11)(13,15)(14,16)(17,20,22,19)(18,21,24,23)(25,28,29,26)(27,31,32,30)(1,3)(2,7)(4,6)(5,8)(9,11)(10,15)(12,16)(13,14)(17,21)(18,19)(20,24)(22,23)(25,27)(26,31)(28,30)(29,32) 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.