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