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