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