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