Books

There are many, many books on R graphics. I recommend the following:

Paul Murrell, R Graphics, 2nd Ed.
R code for figures: https://www.stat.auckland.ac.nz/~paul/RG2e/
Winston Chang, R Graphics Cookbook
R code for figures: http://www.cookbook-r.com/Graphs/
Deepayn Sarkar Lattice: Multivariate Visualization with R
R code for figures: http://lmdvr.r-forge.r-project.org/
Hadley Wickham, ggplot2: Elegant graphics for data analysis, 2nd Ed.
1st Ed: Online: http://ggplot2.org/book/
Complete ggplot2 documentation: http://docs.ggplot2.org/current/

Cheat sheets

R Studio provides a variety of handy cheat sheets for aspects of data analysis & graphics. See: https://www.rstudio.com/resources/cheatsheets/

Many of these are available from the R Studio Help menu