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