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