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