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