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