Relay doesn't solve for you how you should render your components. Relay is "universal" and doesn't even assume it will be running in a browser context. It focuses only on providing an abstraction to work with GraphQL – the same way React focuses only on rendering. Each library solves one single problem at a time (and hell, both are complex enough problem to solve already).
Because these libraries are very generic, it's now up to the community to solve the "more specific" parts. Just search on NPM and you can find tons of React libraries already, some might help you to solve part of the problem you want to solve.
This article demonstrates one use-case: implementing a component handling the scroll of a list to pull more data of a GraphQL connection with Relay.