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