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