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