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