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