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