Use this if you are using igraph from R
| r_pal {igraph} | R Documentation | 
This is the default R palette, to be able to reproduce the colors of older igraph versions. Its colors are appropriate for categories, but they are not very attractive.
r_pal(n)
| n | The number of colors to use, the maximum is eight. | 
A character vector of color names.
Other palettes: 
categorical_pal(),
diverging_pal(),
sequential_pal()