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