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