R(6,8) > 121

Construct a circulant graph on 121 vertices with vertices labeled with 0 to 120. For i > j, the edge joining i and j is colored in the first color if either i - j or 121 - (i - j) is one of the following values:

 2,  4,  5,  7, 11, 12, 13, 14, 15, 18
20, 28, 30, 31, 34, 35, 40, 41, 44, 46
47, 48, 49, 53, 56, 60

Otherwise the edge receives color two. There are no K6's in the first color and no K8's in the second color.

Geoff Exoo