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