I would suggest you dynamically add CSS classes based on the post type the link points to.
Here are the steps to do it :

1- Add javascript something like :

jQuery(document).ready(function ($) {
    $("a").each(function () {
        var link = $(this);
        var url = link.attr("href");

        // Ensure it's an internal link
        if (url && url.startsWith(window.location.origin)) {
            $.ajax({
                type: "POST",
                url: ajaxData.ajaxurl,
                data: {
                    action: "get_post_type",
                    url: url
                },
                success: function (response) {
                    if (response.type === "people") {
                        link.addClass("link-people");
                    } else if (response.type === "events") {
                        link.addClass("link-events");
                    }
                }
            });
        }
    });
});

2- Add ajax code in functions.php like this :

function get_post_type_by_url() {
    if (isset($_POST['url'])) {
        $post_id = url_to_postid($_POST['url']);
        if ($post_id) {
            $post_type = get_post_type($post_id);
            wp_send_json(array('type' => $post_type));
        }
    }
    wp_send_json(array('type' => ''));
}
add_action('wp_ajax_get_post_type', 'get_post_type_by_url');
add_action('wp_ajax_nopriv_get_post_type', 'get_post_type_by_url');

3- Add css

.link-people {
    color: red !important;
}
.link-events {
    color: green !important;
}