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