I am doing linear mixed effect modelling testing the effect of treatment on pitch, with repetitions nested inside items, in turn nested within speakers.
I am looking for ways to present my data like in the following graph, x-axis marking treatment in my case and ColorScheme marking item. I have 10 speakers, so I want to generate 10 graphs, preferably all shown together or in two pages. Is this doable?

Data:

Note on my data:
toneis the treatmentintis the five sample points I take on a repetition, which for graphics purpose should be averaged?semitoneis the dependant variable- I want
speakerto go on the x-axis - I want
itemto be on the ColorScheme (there are three items) - I want
repetitionsaveraged for graphics purpose.
Part of actual data can be found in https://drive.google.com/file/d/0B8Q7ztgF6nEPNWtqRnRsSW1RU0k/view?usp=sharing