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