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