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