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