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