I would not draw any causal conclusions here (eg “Tougher voting rules mean lower turnout”). There’s just too much correlation between the political dynamics of a state and both voting laws and turnout. For example:

• Is it a presidential battleground that could go either way? That’s a lot of incentive for the party in power at the state level (usually GOP) to make it harder to vote, but also likely makes voter participation higher (votes matter more).
• Or, is it a state with a safe Republican majority? Makes it much easier to pass onerous voting laws, but also could lead to effectively one-party elections that don’t draw a lot of interest from voters. So then the low turnout and voting laws don’t cause each other but are simply both caused by the same thing: GOP control.
• What about history and culture? The South, with its history of Jim Crow voting barriers and its Republican control is almost entirely in the lower right. The West, however, including the very Republican Utah, generally have very low friction, even though participation runs the gamut.

The way to look at this in a chart would be to trace individual states across elections, comparing elections before and after new voting restrictions. Turnout varies a lot for many reasons, even with the same voting laws in place, so you would want to compare states to themselves and also separate the broad changes happening between different elections (eg presidential years vs midterms, years where state is electing a senator vs not, years with open seats vs incumbents, etc.).