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