Symbolism occurs in the storm itself, and in the many colors that Chopin uses in her writing. Another strong symbol that can be found in the story is in the bedroom. The bedroom is off of the main room, and Chopin probably did that intentionally, because as soon as Alcee steps into the house to escape the storm he can see the room and the bed. It immediately casts his mind, and Calixta's, to what goes on in the bedroom, and the possibilities that exist there for them. Chopin writes of it, saying,
"The door stood open, and the room with its white, monumental bed, its closed shutters, looked dim and mysterious."
She chose her words carefully there--saying that it was mysterious. Why mysterious? Because a mystery piques people's curiosity, suggests a scandal, and prompts people to investigate. It is all a symbol: Will Alcee and Calixta investigate? Will they discover the scandal? The next reference to the bedroom comes as they give in to their temptation and Calixta is "a revelation in that dim, mysterious chamber." She becomes the answer to the mystery; their love, or tryst, becomes the solution. So, look to the bedroom for another possible symbol--that of temptation--in the story. I hope that helped; good luck!