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