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