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