From Williamsport, take Cross Bridges Rd. and go 1 & 1/2 miles. Turn left on Jimmy Gray Robinson Road. After about 1 & 1/4 miles or when the road bends northward 90 degrees go into the private drive (with permission) and the cemetery will be on your left after you travel 300 yards into the drive. You should see it in the field if my calculations are correct,
Map from Topozone modified for this site by Wayne Austin. 7 Dec 2008.

This map shows the big picture of all the roads needed to get to the Cooke cemetery and is based on the Lat. & Long. coordinates

I believe the cemetery can be found where I have it labeled above. That is a private residence nearby.
Map from MapQuest modified for this site by Wayne Austin. 7 Dec 2008.

The Red Check above denotes that Mr Fred Hawkins has this cemetery marked south of where the USGS mapping service says it is located. We will need to investigate this to determine which is correct.

If Mr. Fred is correct that location is most likely going to be in the thicket with the red + marked on it about the same spot as marked. However, I believe I see a darker spot just to the right of the Check where the vegetative growth is denser. That is an indication of a cemetery. I do not see from these aerial views evidence this cemetery is in the open unless the above using Mr. Fred's location. The above is some 600 yards southeast of the Jimmy Gray Roberson Road on the Big Bigby Creek.