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