It looks to me like we're looking at a new bike right out of the box with the tube protection still on it. Looks like it has an adjustable quill stem. I assume you have done no assembly other than perhaps attaching the bars. We don't see the bars, shifters, etc. I assume you're asking about cable routing and how to make it neater. The thing to understand about cable routing is that there needs to be a good bit of slack in them so that the bars can be rotated 90° in either direction. Also there may need to be extra slack in them to accommodate the adjustments possible in that stem and in the bars. One assumes that the factory cable housing lengths are in general correct.

More explanation and more photos showing the whole bike would be helpful.