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