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