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