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