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