As you probably know, history buff in the narrowest terms, leftist ideologies are centered around large government involvement, while rights favour a free, and open economy. With a small government overseeing enforcement of laws, national defense and little else. So the graph is correct.
The Socialism ideology is on the left of the political spectrum, and, the Fanatical Conservatives of Ralph Klein are the exact opposites of Socialism (they are the Alberta-PC government to those who don't know who they are). Placing them comfortably on the right, the national party of the alliance being the most right of all major political parties in canada, provincial and National.
Pellaken: I dont mean to split hairs, but being from Alberta I can say that Ralph Klein is not more liberal then the CA, if anything, he fits nicely in the middle or to the right of the middle of where the Alliance sits.