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)(13,14,19,22)(15,17,21,18)(16,24,27,23)(20,25,28,26)(1,2,4,3)(5,6)(7,10)(8,9)(11,12)(13,15)(14,17)(16,20)(18,22)(19,21)(23,26)(24,25)(27,28)(6,9)(10,11)(13,16,18,26,19,27,17,25)(14,20,21,24,22,28,15,23)(5,7,8,12)(6,10,9,11)(13,15,18,14,19,21,17,22)(16,24,26,28,27,23,25,20)(1,3,4,2)(13,17,19,18)(14,21,22,15)(16,25,27,26)(20,24,28,23)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.