This graph is the unique rank-3 strongly regular graph with parameters $(1408,567,246,216)$. It is the second subconstituent of the Conway graph on 2300 vertices.
| Number of vertices: | $1408$ |
| Diameter: | $2$ |
| Intersection array: | $\{567,320;1,216\}$ |
| Spectrum: | $567^1 39^{252} (-9)^{1155}$ |
| Automorphism group: | $\mathrm{PSU}(6,2):2$ |
| Distance-transitive: | Yes |
| Primitive |