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