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