A public demo is available here. The preferred browser to run Pintura is Firefox.
Click on the “Open file” button and upload a CIM file or a set of CIM files. You can move the diagram using the arrow keys. To zoom, press Ctrl + up / down arrow keys.
Pintura requires the DiagramObjects to visualize the grid properly. An example CIM file, the IEEE 9-bus system, can be downloaded from here.