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