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