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