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