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