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