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