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