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