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