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