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