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