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