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)(11,13)(12,14)(15,16)(17,18,21,25)(19,27,30,28)(20,24,22,26)(23,29,32,31)(2,4)(9,11,12,15)(10,13,14,16)(17,18)(19,28)(20,24)(21,25)(22,26)(23,29)(27,30)(31,32)(6,8)(17,19)(18,23)(20,29)(21,30)(22,31)(24,27)(25,32)(26,28) involution — undirected(10,14)(13,16)(17,20,21,22)(18,24,25,26)(19,29,30,31)(23,27,32,28)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.