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