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