If you can study bioengineering and take the prerequisite coursework for a bioengineering program, then the fact that you’re at a liberal arts college won’t hurt you. The type of college is not the problem; it’s the necessity of taking a lot of necessary coursework for an engineering degree; that’s why graduate engineering programs usually prefer people with an engineering major from undergrad. I agree with @BrownParent that you should check the websites of some graduate programs in bioengineering and see what kinds of backgrounds they expect their students to have.