You can list or arrange your diagrams in any order you require and display them accordingly in different pages of a PDF document, all you've got to do is;
- Frame the areas you want exported in your PDF document (You can use a frame of your choice)
- Select the frame and click on the 'Shape data' icon in the right-side panel
- Add your desired number in the 'Display index' field
- Click on Export as PDF
See below GIF to understand the simple steps better.
Note: This option is only available for PDF exports.