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