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