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)(19,29)(20,26)(21,23)(22,32)(24,28)(25,31)(27,30) involution — undirected(1,3,6,7)(2,4,8,5)(11,15)(14,16)(17,19,24,31)(18,25,28,29)(20,30,21,22)(23,27,26,32)(1,4,6,5)(2,7,8,3)(9,10,13,12)(11,14,15,16)(17,20,24,21)(18,26,28,23)(19,30,31,22)(25,32,29,27)(1,3)(2,4)(5,8)(6,7)(9,11)(10,14)(12,16)(13,15)(17,21,24,20)(18,26,28,23)(19,22,31,30)(25,32,29,27)(9,12,13,10)(11,16,15,14)(17,22)(18,27)(19,20)(21,31)(23,29)(24,30)(25,26)(28,32)(1,5,6,4)(2,7,8,3)(17,23,24,26)(18,21,28,20)(19,27,31,32)(22,29,30,25)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.