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