¿Cómo cambiar el color de los nodos?

Estoy tratando de cambiar el color de los nodos dependiendo del mes. Por el momento, lo he hecho de esta manera, lo que no es conciso y no funcionaría para grandes conjuntos de datos. ¿Hay una mejor manera de hacerlo?

Data <- read.csv(.....) 

library(igraph)   

MartixData <- as.matrix(Data)

NetworkData <- graph.adjacency(MatrixData, mode="directed", weighted=TRUE)

V(NetworkData)

V(NetworkData)$month <- c("June", "July", "July", "February", "September", "June", "September", "June", "December", "September", "March", "April", "September")

plot(NetworkData, layout=layout.circle, vertex.color=c("yellow", "red", "red", "blue", "pink","yellow", "pink", "yellow", "gray", "pink", "black", "orange", "pink"))

Cualquier ayuda sería muy apreciada!

#Results for dput(NetworkData)
structure(list(13, TRUE, 
  c(0, 1, 1, 2, 5, 6, 7, 7, 8, 9, 10, 10, 12, 12, 12, 12, 12), 
  c(11, 4, 12, 0, 12, 1, 6, 12, 1, 4, 9, 12, 1, 5, 7, 10, 11), 
  c(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16), 
  c(3, 5, 8, 12, 1, 9, 13, 6, 14, 10, 15, 0, 16, 2, 4, 7, 11), 
  c(0, 1, 3, 4, 4, 4, 5, 6, 8, 9, 10, 12, 12, 17), 
  c(0, 1, 4, 4, 4, 6, 7, 8, 9, 9, 10, 11, 13, 17), 
  list(c(1, 0, 1), structure(list(), .Names = character(0)), 
 structure(list(name = c("A", "B", "C", "D", "E", "F", 
    "G", "H", "I", "J", "K", "L", "M"), month = c("June", 
    "July", "July", "February", "September", "June", "September", 
    "June", "December", "September", "March", "April", "September"
    )), .Names = c("name", "month")), structure(list(weight = c(6, 
    6, 7, 6, 7, 6, 6, 7, 7, 7, 6, 7, 7, 7, 7, 7, 7)), .Names = "weight"))), class = "igraph")

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