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