No, if you use the Swift SDK, you don’t need GraphQL, you just add the SDK to your Xcode project via SPM, cocoapods, etc. and you are done.
For Graph, I’m no expert and @davimacedo can provide better explanations than I can, but there are a number of tutorials online that show how to integrate Apollo and use it directly. A detailed one is below:
You don’t need the ParseSwift SDK when using Apollo as it can do everything by itself with it’s own dependencies.