Reorganise nodes to avoid crossing paths

**Is your feature request related to a problem? Please describe.**
There is currently exactly 1 algorithm for organising nodes in the diagram - we go left to right and top to bottom in a square.

**Describe the solution you'd like**
It would be good to see the nodes reorganised to minimise path crossing.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.