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