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