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