I have 2D line with varying color using surface. How do I modify colorbar for this plot without axes issues?

I used Matt's answer from question How do I vary color along a 2D line? to create a line with color that varies along the line by plotting a surface. When I add a colorbar to this plot I get numbers all over the graph. The numbers correspond the axis labels. I got around this issue by giving location for colorbar. What I really want to do is have same colorbar scale for multiple plots. The same issue arises when I change the scale of the colorbar. Here is an example of my problem using Matt's code:

x = 0:.05:2*pi;
y = sin(x);
z = zeros(size(x));
col = x;  % This is the color, vary with x in this case.

surface([x;x],[y;y],[z;z],[col;col],...
      'facecol','no',...
      'edgecol','interp',...
      'linew',2);

h=colorbar('location','east');
caxis([-0.8,0.8]);

This issue occurs if I do not specify a location for colorbar or when I modify the scale using caxis. How do I to solve this issue and keep labels on my axes?