Graphic Designers think in terms of color, typography, space, ... They are visual thinkers. And yes, the visual aspects of a software impact the user experience.
UX designers focus on what is the problem that the client/user is trying to solve, what functionality will the software need to solve that problem and how does that functionality will be presented to the user.
Then we can start thinking about color, typography other visual design aspects.
UX experience first, Graphic design second.