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