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