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