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