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