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