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