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