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