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