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