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