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