Annotate Phylogentic Tree with classes

Question

[BIANCA]

Hello. I am working on phylogenetic analysis of a gene. I downloaded all the genes orthologous sequences from NCBI, did the alignment with ClustalOmega, which also provides the phylotree file of the phylogenetic tree. Each node has assigned the tax_id from NCBI. How can I modify the tree so that the various taxonomic classes of organisms are highlighted in different colors? I have tried IToL, dendropy and ETE3 but with little success. This is my first time to approach this kind of study.