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