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)(20,28)(21,23)(22,26)(24,29)(27,31)(30,32) involution — undirected(1,2)(3,4)(17,19,20,26,21,27,29,32)(18,22,24,25,23,30,28,31)(2,4)(10,13)(14,16)(18,23)(22,30)(24,28)(25,31) involution — undirected(6,8)(9,11,12,15)(10,14,13,16)(19,26)(20,29)(22,25)(24,28)(27,32)(30,31)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.