Actually, I have three cats and they and Thor get along pretty well. At worst, they leave them alone. But they love basking in the sunlight on my nightstands when the sun is shining in, right next to one another.
Right now, you're making your beardie off limits to your cat, which is making your cat even more curious. And spraying your cat with a water bottle is mean. You can train a cat without aerating them with water. Just an FYI.
What I would do is introduce your two pets to each other in closely supervised conditions. Hold your beardie in your lap and let your cat get close. Let him sniff your beardie and whatnot. Of course don't let him hurt the little guy, but sit there for as long as your cat is interested. Eventually, your cat will get bored and leave. Do this for a while and eventually you should be able to let your beardie run without concern for his safety.
Also, get a cat tree and set it up right next to the habitat, or get some cat shelves that you can mount on the wall above the habitat. Your cat can then watch the beardie without laying on the top of the habitat. And if you have a table or something that you can set up next to the habitat for your cat to sit on, he can watch you handle your beardie and clean the habitat without being bossy or disruptive.
The point is to make the beardie completely uninteresting to your cat. Calm his curiosity and he won't care what you do with your dragon.
