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