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