Fiona:
although Servalan may be President, all of her rivals, staff and subordinates (with a single exception) do appear to be male.
Off the top of my head, women in reasonably senior positions in Federation Civil Admin or military include Major Thania, Governor LeGrande, Kasabi, the Arbiter and Alta Morag in The Way Back.
Two additional potential biasing factors suggest that there may be a greater proportion of woman than this might suggest:
(1) We mainly see (the military) Space Command not the Earth (civil) equivalent; there may well be more woman in the civil administration compared with military, there may also be more women on Earth cf on space station
(2) Servalan may gather men around her as subordinates, for whatever reason (liking pretty ones or feeling more comfortable around men?); furthermore, the politcos we see visit S may have been chosen to be ones she would listen to as equals or superiors, again potentially biasing by gender
Tavia