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