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