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)(11,15)(12,14)(13,16)(18,22)(23,30)(24,31)(25,29)(1,3,5,8)(2,6,7,4)(9,11,12,16)(10,13,14,15)(17,18,19,22)(20,23,26,30)(21,29,27,25)(24,32,31,28)(10,14)(13,15)(18,23)(20,28)(21,27)(22,30)(24,25)(26,32)(29,31) involution — undirected(1,4,5,6)(2,3,7,8)(11,16)(13,15)(18,22)(23,30)(24,31)(25,29)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.