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