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