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