baseballr | package written for R | Analytics library

I am attempting to create a plot in R, plotting simple X & Y coordinates of individual locations for each pitch on a scatter-plot, categorized for different pitch types (baseball). There are 13 total possible pitch types, but my graph will only show between 3-7 types... not pitcher throws all 13 types. In addition to individual locations for each pitch, I want to plot the average locations, split by pitch type.

I want to assign each pitch type ("CH", "CU", "FF", ...) specific color-hex codes. Bear in mind, I plan to use this for other pitchers, with different pitch types (all coming from the same set of 13 pitch types). I would like the colors to be consistent across these different plots.

Currently, I am able to plot each individual X & Y coordinate, along with the averages. However, I cannot figure out how to assign my desired color-hex codes for each pitch type.

Here is my code: