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