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