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