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