Standard generators of O8-(3) are a and b where a is in class 2A, b is in class 4F, ab has order 41, abb has order 6 and ababb has order 41. (Source: ATLAS)
Standard generators of the double cover 2.O8-(3) are preimages A and B where AB has order 41 and ABABB has order 41. (Source: ATLAS)