Open the Script Editor or AppleScript Editor in one of the subfolders of Applications and run the following:
tell application "Finder" to quit
if (do shell script "defaults read com.apple.finder AppleShowAllFiles") is "1" then
do shell script "defaults write com.apple.finder AppleShowAllFiles 0"
do shell script "defaults write com.apple.finder AppleShowAllFiles 1"
tell application "Finder" to run
If you change your mind later, run the script again.
Is the NFS volume actually mounted under /Volumes/name_of_the_NFS_volume ?
If it is mounted somewhere else, then maybe you should consider changing the mount point.
Or create a Unix symlink from /Volumes to where it is actually mounted
ln -s /path/where/you/mounted/the/nfs/volume /Volumes/my_name_of_NFS_volume