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