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