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