Trans is an umbrella term for different types of trans identities. To be a trans person has nothing to do with sexual orientation. A trans person can identify as a man, woman or both, in between or neither, independently of what gender the person was assigned at birth. The variation and diversity is huge.
You can read more about being trans here:
TGDR – Transgender day of remembrance November 20th is a day where we honor the trans people who have been murdered during the past year.