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