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