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