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