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