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