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