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