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