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