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