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