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