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