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