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