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