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