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