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