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