Hello SkiCan
Yes, you can use a Saver Day Pass from Geneva until the border station, usually Buchs SG. You need a ticket from this station to Innsbruck.
If you want to reserve a seat from Zürich to Innsbruck, you can make this reservation separately on Oebb,at. Tickets from Buchs SG to Innsbruck are also available on this site.
Kind Regards
Danhiel