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