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