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)(13,14,17,20)(15,19,24,26)(16,21,27,23)(18,22,28,25)(5,7,9,8)(6,10,12,11)(13,15,17,24)(14,19,20,26)(16,25,27,22)(18,23,28,21)(2,4)(5,7,9,8)(6,11,12,10)(14,20)(15,23)(16,26)(18,28)(19,27)(21,24)(5,7,9,8)(6,11,12,10)(13,16)(14,21)(15,22)(17,27)(18,26)(19,28)(20,23)(24,25)(5,8,9,7)(6,10,12,11)(15,21)(16,26)(18,28)(19,27)(22,25)(23,24)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.