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