First of all you need to understand the differences between EF and Dapper. Basically Dapper is a micro-ORM that has minimal features compared with EF. Entity Framework has a lot of features included along with performance improvements and others (more details here).
As the dapper is a Micro-ORM you don't have the same features available in EF. You can use dapper.contrib that has some abstractions that helps you with generic repository.
I have an example in my github an application that use dapper in repository (without dapper.contrib) with clean arch.