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