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