I found some stuff pretty fast, but via a german language search text string (I used "wandern durch die schweiz", that turned up quite a bit).
For example,
http://www.wandersite.ch/TransSwissTrail.html
http://www.fernwege.de/ch/westost-1/index.html
http://de.wikipedia.org/wiki/Schweizer_Wanderwege

The first link above does have a crude map at least (I didn't do any kind of exhaustive search; these were among the first few links that turned up).

From your search results you can perhaps come up with alternate german language search text options to try, for example, "wanderreisen durch die Schweiz", or "wandern in der Schweiz", etc.

Ah, and on reflection a perhaps better search string would be "Fernwanderweg Porrentruy - Chiasso" (this from the first of the above three links).

For the non-German speaker (reader), there are of course a lot of online utilities to do some crude translation of text (babelfish, etc), and in some cases you might encounter sites that offer an english language version of the site.

I spent a too-short time walking hut-to-hut in the Alps in Austria this September, and it was a great deal of fun. Certainly not an inexpensive place to hike, but it was great to experience that whole deal, and a lot of fun meeting people and seeing the sights, getting used to their system in general. The Trans Swiss Trail would no doubt be a hoot too.