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