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