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