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