According to that book "The Truth About Herpes" herpes does not "cause" cervical cancer, or cancer of any kind. There is a correlation between them, but that doesn't mean one causes the other. A correlation simply means there's a (third) common factor between them somehow.
It's possible that because HPV (human papillomavirus, which causes genital warts, some of which are cancer-causing) is very common and I believe is the most common cause of cervical cancer, and since both herpes and HPV are sexually transmitted, the common thread is sexual activity or possibly more common with multiple partners. The correlation isn't fully understood but one does not cause the other.
If you're concerned, the best thing to do is be sure to get a Pap Smear done every other year (or more frequently; ask your doctor about this). Pap smears will pick up irregularities that indicate a possible pre-cancerous condition.