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