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