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