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