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