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