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