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