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