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