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