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