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