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