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