“The Madison” star Elle Chapman says the atmosphere on set of “American Horror Story” was a bit more relaxed than that of Taylor Sheridan’s series because the creator is very set in what he wants. Chapman, 27, plays Paige McIntosh, a spoiled Park Avenue socialite forced to adapt to life in Montana with her family, which includes her mom, played by Michelle Pfeiffer, on “The Madison.” She’s also showing off her acting chops by appearing in the upcoming 13th season of “American Horror Story” as a character named Ashley. The actress told Page Six exclusively at the FX series premiere in New York earlier this week, that on “AHS,” she “really…
