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