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