Does the device that is not off have black color?
No, the telephone is blue.
    src        edge_attr  dst
0     1               on    8
1     1   to the left of    7
2     1  to the right of    3
3     3   to the left of    1
4     4   to the left of    9
5     4          holding    8
6     4          holding    5
7     4   to the left of    6
8     5   to the left of    6
9     5   to the left of    9
10    6  to the right of    4
11    6  to the right of    9
12    6  to the right of    5
13    7  to the right of    1
14    7               on    8
15    8               on    3
16    8             with    7
17    9  to the right of    4
18    9   to the left of    6
19    9  to the right of    5
20   10               on    9