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