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