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)(19,22)(20,25)(21,24)(23,28)(26,29)(27,31)(30,32)(9,11)(10,13)(12,16)(14,15)(18,19)(21,29)(23,25)(27,32) involution — undirected(2,3)(10,12)(11,15)(17,19,22,18)(20,25,28,23)(21,26,29,24)(27,31,32,30)(1,3,4,2)(5,6)(7,8)(9,12,14,10)(11,16,15,13)(17,20)(18,23)(19,25)(21,27)(22,28)(24,30)(26,31)(29,32)(9,13,14,16)(10,15,12,11)(17,21)(18,24)(19,26)(20,27)(22,29)(23,30)(25,31)(28,32)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.