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