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