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