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