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