Graph Options
Graphviz provides many options for customizing the graph output, and Org-roam supports some of them. See https://graphviz.gitlab.io/_pages/doc/info/attrs.html for customizable options.
User Option: org-roam-graph-filetype
The file type to generate for graphs. This defaults to "svg".
User Option: org-roam-graph-extra-config
Extra options passed to graphviz for the digraph (The “G” attributes). Example: '~(("rankdir" . "LR"))
User Option: org-roam-graph-node-extra-config
An alist of options to style the nodes. The car of the alist node type such as "id", or "http". The cdr of the list is another alist of Graphviz node options (the “N” attributes).
User Option: org-roam-graph-edge-extra-config
Extra options for edges in the graphviz output (The “E” attributes). Example: '(("dir" . "back"))