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