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