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