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