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