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