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