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