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