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