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