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