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