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