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