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