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