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