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