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