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