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