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