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