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