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)(13,14,18,21,19,22,17,15)(16,20,24,27,25,28,26,23)(5,6)(7,11)(8,10)(9,12)(13,15)(14,17)(16,23)(18,22)(19,21)(20,26)(24,28)(25,27) involution — undirected(1,2,3,4)(5,7)(6,9)(8,12)(10,11)(13,16,19,25)(14,20,22,28)(15,23,21,27)(17,26,18,24)(7,12)(9,11)(13,14,17,15,19,22,18,21)(16,20,26,23,25,28,24,27)(6,10)(9,11)(13,17,19,18)(14,21,22,15)(16,24,25,26)(20,23,28,27)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.