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