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