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