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