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