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