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