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