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