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