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