How to create sublists obeying the connection of cells in an array

Friends, I'm trying to create sublists from an array to target cells that are connected, such as the array below:

From this matrix I get this list with the painted cells:

lista = [[1, 1], [2, 1], [2, 2], [2, 3], [2, 5], [2, 6], [3, 2], [3, 5], [3, 6], [6,1], [6, 4], [6, 5], [7,1], [7, 4], [7, 5]]

I want as a result, sublists with yellow cells, grouped like this:

[[1, 1], [2, 1], [2, 2], [2, 3], [3, 2]],
[[2, 5], [2, 6], [3, 5], [3, 6]]
[[6,1], [7,1]]
[[6, 4], [6, 5], [7, 4], [7, 5]]

I do not know if it is possible, but so far, with the function below:

def group_by_diff(group, diff=1):
    container = []
    new_group = [group[0]] 
    for i in range(1,len(group)):
        if((group[i][0] - group[i-1][0] > diff) or (group[i][1] - group[i-1][1] > diff)):
            container.append(new_group)
            new_group = [group[i]]
        else:
            new_group.append(group[i])
    if(len(new_group) > 0):
        container.append(new_group)
    return container

I get this result only:

[[1, 1], [2, 1], [2, 2], [2, 3]], 
[[2, 5], [2, 6], [3, 2]], 
[[3, 5], [3, 6]], 
[[6, 1]], 
[[6, 4], [6, 5], [7, 1]], 
[[7, 4], [7, 5]]

What do not answer, in this example have created 6 sublists, where in fact only 4 agglomerations should be created, according to the image.

I hope you have made me understand. Thank you.