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