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