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