[igraph] iGraph plot - labels text-searchable?

[Chris Irwin]

I've plotted several graphs for visualizing medium-sized directed
graphs (300-400 nodes), and have found this library very useful.  But
so far I've only produced PNG images.  This has the drawback of not
being easily searchable.

I was wondering if anyone had any experience plotting an iGraph layout
in such a way that the graph node labels are searchable.  I'm thinking
of a large pdf or a visio document, for example.  Any ideas how to do
that?

Thanks