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