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