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