Board Thread:Naruto Discussions/@comment-28939725-20161116235549/@comment-2006510-20161117224933

^I would imagine so. Indra's Susanoo was purple in color, and since Sasuke is the latest reincarnation of Indra, his would similarly be purple

In contrast, Madara was also a reincarnation of Indra, but at the same time he unknowingly combined Indra's chakra with that of Asura's (from Hashirama's DNA), recreating Hagoromo's chakra in addition to giving him the Rinnegan. As a result, his Susanno color 'probably' changed from purple to the blue color we saw