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