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