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