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