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