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