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