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