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