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