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