According to this explanation:
It represents the system that abducts children and, more importantly,
the state of mind control these children are forced to live in.
After days of torture, Alex Jones finally says to Keller: “I am not
Alex Jones”, implying that he was abducted by Holly and that he was
given an alter persona. When Keller asks him where the kidnapped
children are, Jones replies: “They’re in the maze. That’s where you’ll
find them.” Of course, Jones does not refer to an actual maze but to
the state of mind control the children are subjected to.
Later, Detective Loki finds a suspect named Bob Taylor who acts in
bizarre matter and who was also a victim of Holly Jones. He stayed at
her house for three weeks and was drugged with a LSD/Ketamine drug
cocktail, which is classic a mind control technique. Bob managed to
escape from the house, but while Bob is free, his mind is definitely
not. We quickly realize that he is still “stuck in the maze”.
While Bob’s “maps” do not actually lead to the physical location of
the children, it leads to their psychological state: Trapped in the
mind control maze of their handler. In actual mind control, mazes are
an important trigger image that accurately represents a slave’s mind
state. “Maze maps” are programmed into the victim’s internal world to
keep them from accessing their core/true personality.