Here are the notes from the diagram written in standard music notation and tablature.
These notes can be used to play literally thousands of melodies in the key of C major. It is not necessary to always start and finish on the note C. Depending on which chords you are playing over, it may sound best to start on any of the notes in the scale. For example, if you were playing over a C chord followed by a D minor chord you could play the scale starting on C for the C chord but start on D for the D minor chord, as shown in the following example. This is a modal approach to playing scales.