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)(18,24)(21,22)(25,32)(26,29)(27,28)(30,31) involution — undirected(2,5)(3,7)(9,10)(11,15)(12,14)(13,16)(17,18,21,27,23,28,22,24)(19,29,31,32,20,25,30,26)(2,5)(6,8)(9,11,12,16)(10,13,14,15)(17,19)(18,25)(20,23)(21,31)(22,30)(24,32)(26,27)(28,29)(1,3,4,7)(2,6,5,8)(11,16)(13,15)(17,20,23,19)(18,26,28,32)(21,31,22,30)(24,29,27,25)(10,14)(13,15)(17,21,23,22)(18,27,28,24)(19,30,20,31)(25,32,29,26)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.