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)(11,15)(14,16)(17,18,22,26)(19,27,29,32)(20,25,21,24)(23,30,31,28)(2,5)(6,8) involution — undirected(1,3,4,7)(2,6,5,8)(11,15)(13,16)(17,19)(18,23)(20,30)(21,28)(22,29)(24,32)(25,27)(26,31)(9,10,12,14)(11,16,15,13)(17,19)(18,23)(20,28)(21,30)(22,29)(24,27)(25,32)(26,31)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.