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