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