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