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