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