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