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