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