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