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