How to implement transaction scope in EF

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entity-framework

I'm implementing EF6 using Generic Repository Pattern. how I can implement Transaction?

my project structure is as below

DataAccess Layer in which I have Generic Repository Pattern class

public interface IGenericRepository<t> where T : class {

    IQueryable<t> GetAll();
    IQueryable<t> FindBy(Expression<func>&lt;t,>> predicate);
    void Add(T entity);
    void Delete(T entity);
    void Edit(T entity);
    void Save();
}

In Domain Layer I need to perform multiple insertions through Generic Repository. how i can implement transaction.Without adding the EntityFramework reference in Domain layer, how i can achieve this