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