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