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