JGuitar's scale calculator will draw scale diagrams showing the fretboard with notes in the selected scale highlighted. Adjust the "start fret" option to further highlight a finger pattern for playing the selected scale in a different position on the fretboard. Hit "Go" to see the result. Scale diagrams can also be labeled with either letters or scale degrees.
Important: The fretboard is shown with the lowest pitch string at the bottom and the highest pitch string at the top (unless you've tuned your instrument differently.)