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