Panting is not a normal cat behavior, though occasionally they will do so after strenuous exercise. Panting can be a sign of heart problems, so I would make an appointment with your vet to have your kitty checked out.
Blossom would always pant after a frantic attack of the zoomies. It was during our extremely hot & humid summer. I had the vet check her out each time she went in for her 1st vac's & desexing. She's never know other cats as we've had her since she was 3 weeks old. Her only playmates are our 2 dogs. Now that its winter she no longer pants.
But just to be on the safe side, if it happens too frequently, have her checked by the vet.
Holly, my younger cat, started panting once in the car and I thought she was having a heart attack. My vet told me that cats pant when feeling stressed out or excessively hot. Nonetheless, I would definitely keep an eye out for her. My roommate's cat started panting because she could not breathe and ultimately died of a cardiac arrest later that night.
My vet said panting is normal after a lot of play. He said it's unusual for a cat to play to that point, but some do. If I break out the laser or feather toy, Paris will play till she pants. Just be sure to allow them to rest on a cold surface and hide the toys so they can catch their breath. Paris usually goes for the cold tile in the bathroom to cool down.
My Daughter bought Lucky a feather toy, which she goes absolutely crazy over, Lucky is fine this morning, I told the kids to play with her for a while then put the toy up, I think they just played to hard with her, she is only 8 1/2 weeks old. The kids were excited and so was she.