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