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