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