What's the best practice for Accessing S3 Pre signed url using custom domain name

When we create a preSigned url using the java sdk , The url contains the bucket name "https://bucketName.s3.region.amazonaws.com/objectkey?X-Amz-Security-Token=********"

How ever we would like it be our domain name instead of exposing the buckname and on amazonaws.com like : "https://mydomain.com/objectkey?X-Amz-Security-Token=********"

What is the best way to achieve this ?