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