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